Advanced Pagination WordPress Roots Theme

roots-pagination.php

<?php
if ( !function_exists('your_pagination')) :
  function your_pagination($custom_query) {

    if ( !$current_page = get_query_var( 'paged' ) ) $current_page = 1;

    $permalinks = get_option( 'permalink_structure' );
    if( is_front_page() ) {
      $format = empty( $permalinks ) ? '?paged=%#%' : 'page/%#%/';
    } else {
      $format = empty( $permalinks ) || is_search() ? '&paged=%#%' : 'page/%#%/';
    }

  $big = 999999999; // need an unlikely integer

  $pagination = paginate_links( array(
    'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
    'format' => $format,
    'current' => $current_page,
    'total' => $custom_query->max_num_pages,
    'mid_size' => '4',
    'type' => 'list',
    'next_text' => __( 'Next' ),
    'prev_text' => __( 'Previous' )
    ) );

  $pagination = explode( "\n", $pagination );
  $pagination_mod = array();

  foreach ( $pagination as $item ) {
    ( preg_match( '/<ul class=\'page-numbers\'>/i', $item ) ) ? $item = str_replace( '<ul class=\'page-numbers\'>', '<ul class=\'pagination\'>', $item ) : $item;
    ( preg_match( '/class="prev/i', $item ) ) ? $item = str_replace( '<li', '<li class="pagination-prev"', $item ) : $item;
    ( preg_match( '/class="next/i', $item ) ) ? $item = str_replace( '<li', '<li class="pagination-next"', $item ) : $item;
    ( preg_match( '/page-numbers/i', $item ) ) ? $item = str_replace( 'page-numbers', 'page-numbers pagenav', $item ) : $item;
    $pagination_mod[] .= $item;
  }
  
  ?>
  
  <div class="pagination">

    <p class="counter">
      <?php printf( __( 'Page %1$s of %2$s' ), $current_page, $custom_query->max_num_pages ); ?>
    </p>
    
    <?php foreach( $pagination_mod as $page ) {
      echo $page;
    } ?>

  </div>

  <?php }
endif;

Hey there, I notice this is quite old but was wondering if you still use it? Tried to use it myself but when I go to page 2 (for example), the page 1 is not clickable so Im not able to return to page 1